VSCode - Package to a VSIX file

[jdesrosiers]

Provide a script (npm run package) for packaging the extension into a VSIX file that can be used to install the extension in VSCode. The @vscode/vsce package provides a vsce package command that can be used, but there are some complexities to getting it to work. It requires that you bundle both the extension and the server, which can be difficult when dealing with native components and mix ESM/CJS dependencies.

Reference: https://code.visualstudio.com/api/working-with-extensions/publishing-extension#packaging-extensions

Depends on: #1